List the three major constituents of sewage.

What are the common sources of oil spills, and how do they affect sea life.

Briefly mention about 'Swachh Bharat Abhiyan'. When was it launched and what are its objectives?

Define the following terms:

(a) Pollution

(b) Waste

(c) Air pollution

(d) Oil spills

(e) Pesticides

(f) Sanitary landfills

(g) Noise